The Samsung Galaxy Fold3 5G is available at lower prices (plus an extra 5% off now) on the Samsung Education Store (valid .edu email required) if you trade-in a mobile phone and receive the $300 bonus.
Special thanks to ozbargain member "hopper" for the heads on up on the extra 5% off on top of the previous prices: https://www.ozbargain.com.au/node/650251
Note that if you don't return the trade-in, you must pay the full trade-in value in lieu. You should be able to retain the trade-in bonus based on other similar deals (e.g. https://www.ozbargain.com.au/node/649004). Note that they may still charge a “non return” admin fee; it appears to be around $60 as per the other threads.
This might be a better outcome if your valuation is too low.
I'm not sure if this is stackable with the $50 newsletter voucher. Let me know if it works.